reaction force

简明释义

反力

英英释义

例句

1.When a person jumps off a diving board, the board exerts a reaction force 反作用力 that propels them into the air.

当一个人从跳板上跳下时，跳板施加的reaction force 反作用力 将他们推向空中。

2.The reaction force 反作用力 from the ground allows athletes to run and jump effectively.

地面产生的reaction force 反作用力 使运动员能够有效地奔跑和跳跃。

3.As the rocket engines fire, the reaction force 反作用力 pushes the rocket upward.

当火箭发动机点火时，产生的reaction force 反作用力 将火箭推向上方。

4.In a car crash, the seatbelt provides a reaction force 反作用力 to keep passengers safe.

在汽车碰撞中，安全带提供的reaction force 反作用力 可以保护乘客的安全。

5.When you push against a wall, the wall exerts an equal and opposite reaction force 反作用力 back on you.

当你推墙时，墙会施加一个相等且相反的reaction force 反作用力 回到你身上。

作文

In the realm of physics, the concept of force is fundamental to understanding how objects interact with one another. One specific type of force that plays a crucial role in these interactions is known as reaction force. The reaction force is defined as the force that is exerted by a surface in response to an object resting on it or applying pressure against it. This principle is famously encapsulated in Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another, the second object exerts a force of equal magnitude but in the opposite direction back onto the first object.To illustrate this concept, consider a simple example: a person standing on the ground. When the person applies a downward force on the ground due to their weight, the ground responds by exerting an equal and opposite force, the reaction force, pushing upward against the person’s feet. This upward force is what allows the person to remain standing without falling through the ground. If the reaction force were not present, the person would accelerate downwards due to gravity.The significance of the reaction force extends beyond just standing still. It is also crucial in various activities such as jumping, running, and even driving a car. For instance, when a person jumps, they push down on the ground with their legs, generating a downward force. According to Newton's Third Law, the ground responds with an equal and opposite reaction force that propels the person upwards into the air. Without this reaction force, jumping would be impossible.In the context of vehicles, understanding reaction forces can help explain how cars accelerate and brake. When a car accelerates, the tires push backward against the road. In response, the road exerts a forward reaction force on the tires, propelling the car forward. Similarly, when braking, the tires exert a force forward against the road, and the road pushes back with an equal and opposite reaction force, allowing the car to decelerate.Furthermore, the concept of reaction force is not limited to solid surfaces. It also applies to fluid dynamics. For example, when a swimmer pushes water backwards with their hands and feet, the water exerts a reaction force that propels the swimmer forward. This interaction is vital for efficient swimming and demonstrates how reaction forces are integral to movement in various environments.In conclusion, the reaction force is a fundamental concept in physics that illustrates the interconnectedness of forces in our world. Whether we are standing, jumping, driving, or swimming, the presence of reaction forces enables us to perform these actions effectively. Understanding this concept not only enhances our knowledge of physics but also provides insight into the mechanics of everyday life. By recognizing the importance of reaction forces, we can better appreciate the balance and harmony of forces that govern motion and interaction in our universe.

在物理学领域，力的概念是理解物体如何相互作用的基础。一个特定类型的力在这些相互作用中起着至关重要的作用，它被称为反作用力。反作用力被定义为表面对一个物体施加压力或静止在其上的物体所施加的力。这一原理在牛顿第三运动定律中得到了著名的阐述，该定律指出，对于每一个作用力，都有一个大小相等、方向相反的反作用力。这意味着，当一个物体对另一个物体施加力时，第二个物体也会以相同的大小但相反的方向对第一个物体施加力。为了说明这一概念，考虑一个简单的例子：一个人站在地面上。当这个人由于自身的重量向地面施加向下的力时，地面通过施加一个等量的、方向相反的力——反作用力，向上推着这个人的脚。这个向上的力使得这个人能够保持站立，而不会掉进地面。如果没有反作用力，这个人将由于重力而向下加速。反作用力的重要性不仅限于静止状态。它在跳跃、奔跑甚至驾驶汽车等各种活动中也至关重要。例如，当一个人跳跃时，他们用腿向下推地面，产生一个向下的力。根据牛顿的第三定律，地面以相等且相反的反作用力回应，推动这个人向上进入空气。如果没有这种反作用力，跳跃将是不可能的。在车辆的背景下，理解反作用力可以帮助解释汽车如何加速和制动。当汽车加速时，轮胎向后推地面。作为回应，地面对轮胎施加一个向前的反作用力，推动汽车向前。同样，当刹车时，轮胎向前对地面施加力，地面以相等且相反的反作用力回应，使汽车减速。此外，反作用力的概念并不限于固体表面。它同样适用于流体动力学。例如，当游泳者用手和脚向后推水时，水会施加一个反作用力，将游泳者向前推进。这种相互作用对于高效游泳至关重要，并展示了反作用力在各种环境中运动中的重要性。总之，反作用力是物理学中的一个基本概念，说明了我们世界中力的相互联系。无论我们是在站立、跳跃、驾驶还是游泳，反作用力的存在使我们能够有效地执行这些动作。理解这一概念不仅增强了我们对物理学的知识，也提供了对日常生活机制的深入了解。通过认识到反作用力的重要性，我们可以更好地欣赏支配我们宇宙中运动和相互作用的力量的平衡与和谐。